"Had we not received that tip today, these girls probably would not have been alive in the morning," Iron County Sheriff's Lt. Del Schlosser told CBS in Denver.

Authorities rescue Dinah and Hattie Coltharp on Monday.

(CBS 4 Denver)

Video produced by CBS shows the young girls being rescued in darkness. Their grandfather is concerned about what they endured.

"There’s no doubt in my mind they have been going through complete indoctrination," Steve Soble told CBS.

Dinah (left) and Hattie had been missing for three months.

(Iron County Sheriff's)

The 33-year-old Coltharp's interest in polygamy and "prepping" for doomsday had intensified in recent years, according to relatives. Coltharp and Shaffer met online and eventually formed the Knights of The Crystal Blade.

Shaffer was charged with child kidnapping and child abuse, while Coltharp is being held for custodial interference, according to the Salt Lake Tribune. Shaffer has two daughters, and they were also found.